PSSH box decoder  

This tool decodes a PSSH box or sequence of PSSH boxes that are used to initialize DRM systems for streaming media. You will typically find a PSSH box:

• inside a <cenc:pssh> element in a DASH MPD manifest;
• within a pssh box in the initialization segment of a media stream (an fMP4 fragment);
• in DRM initialization data passed to the Encrypted Media Extension of a web browser;
• in an EXT-X-SESSION-KEY field of an m3u8 playlist.

This tool is implemented in WebAssembly (WASM) and runs fully inside your web browser. There is no server backend; the tool will work fully offline. It supports the following DRM systems:

• Widevine, owned by Google, widely used for DASH streaming
• PlayReady, owned by Microsoft, widely used for DASH streaming
• Irdeto
• Marlin
• WisePlay, owned by Huawei
• The unofficial variant of Apple FairPlay that is used for DASH-like streaming by Netflix
• Common Encryption (CENC)

For Widevine initialization data, you can cross-check the output from this tool by comparing it with the output from the pssh-box.py script included with shaka-packager. If you have Podman or Docker installed, run the commandline script safely sandboxed in a container as follows:

podman run --rm docker.io/google/shaka-packager:latest pssh-box.py --from-base64 <the-pssh>